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LangChain Forum - Topics tagged python-help

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Qwen 3.5 tool calling
2026-03-28 · via LangChain Forum - Topics tagged python-help

1

For tool calling to work on Qwen 3.5, I had to apply the following patch:

import langchain_community.chat_models.llamacpp as _lcpp
# Patch Qwen3 chat template: expects tool-call arguments as dict, not JSON string.
_lcpp._lc_tool_call_to_openai_tool_call = lambda tc: {
    "type": "function",
    "id": tc["id"],
    "function": {"name": tc["name"], "arguments": tc["args"]},
}

Anyone else experiencing this issue?

Hi @fcorneli

could you report an issue in the repo? I might know what’s the root cause and have a fix for it

3